[ I or T ] to make a series of quick delicate movements up and down or from side to side, or to cause something to do this(使)飘动,挥动,颤动;拍(翅);鼓(翼)
[ I ] If your heart or stomach flutters, you feel slightly uncomfortable because you are excited or nervous.(心)怦怦乱跳;(胃)颤动
[ C usually singular ] a short period of excited activity一阵兴奋(或激动)
[ C usually singular ] UK informal a small bet (= money risked), especially on a horse race(尤指赛马中的)小赌注
[ S ] a quick up-and-down movement振动;颤动;忽闪
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